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  • 1 Geologisches Institut der Universität Köln Lehrstuhl für Eiszeitenforschung Zülpicher Str. 49 D-5000 Köln 1 FRG
  • | 2 Université Catholique de Louvain Laboratoire de Chimie Inorganique et Nucléaire Chemin du Cyclotron 2 B-1348 Louvain-la-Neuve Belgium
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Envestigations on the behaviour of the defect centres in calcites by means of electron spin resonance spectroscopy /ESR/ have shown the occurrence of important interferences, which may have an impact on age determinations. These effects are produced by humic acids, sunlight exposure, grinding, instability of paramagnetic centres, measurement conditions, and possible pretreatment of the sample. The consequence of these interferences are discussed.